User manual

SETTINGS
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112112
907X 50C USER GUIDE
True Exposure is an XCD and HC/HCD lens function that
allows the effective shutter speed to remain unaffected when
stopping down. This effect is perhaps not so commonly
understood as it is restricted specically to integral lens
shutters as opposed to focal plane shutters.
When a lens is stopped down, the effective shutter speed
becomes longer, consequently affecting the set exposure. At
slow shutter speeds the effect is minimal but at faster speeds,
e.g. 1/500s, the effect becomes clearly visible. Automatic
compensatory measures in speed setting adjustments are
employed.
As compensation can only be put into effect where speeds
can be adjusted, this prevents the possibility of adjusting the
fastest speed. To counter this, compensatory adjustments are
therefore made to the aperture instead to retain the set expo-
sure. This compensation is not always required and when using
ash/strobe as the main light source it is actually undesirable
because compensation will result in underexposure. Therefore,
when using ash/strobe as the main light source, you should
set True Exposure to OFF in Main Menu > Camera Settings >
Exposure > True Exposure
in the Camera Display.
You can download a complete explanation of this situation
at www.hasselblad.com.
Time
Light level at
image plane
Maximum aperture
Stopped down one stop
with True Exposure ON
Stopped down one stop
with True Exposure OFF
T fully open
T stopped down = T Fully open
T stopped down > T Fully open
(Using True Exposure)
(Without True Exposure)
TRUE EXPOSURE EXPLAINED